Stadium: Court 4 Round: 44 Ground: Clay
| ITF M15 Szarajevó | 2021/05/31 12:00 | Domagoj Biljesko v Stevan Popovic | 6-1,6-2 |
| ITF M25 Kiseljak | 2021/05/26 10:00 | Domagoj Biljesko v Tim Heger | 6-7,6-2,3-6 |
| ITF M15 Brcko | 2021/05/21 11:20 | Artem Dubrivnyy v Domagoj Biljesko | 6-4,7-6 |
| ITF M15 Brcko | 2021/05/18 14:00 | Domagoj Biljesko v Maikel De Boes | 6-3,7-5 |
| ITF M15 Sibenik | 2021/04/20 08:00 | Domagoj Biljesko v Christian Sigsgaard | 6-1,6-7,4-10 |
| ITF M15 Sibenik | 2021/04/19 09:15 | Domagoj Biljesko v Luka Mikrut | 6-4,7-5 |
| ITF M15 Sibenik | 2021/04/18 10:00 | Domagoj Biljesko v Peter Samosi | 6-2,6-2 |
| ITF M15 Opatija | 2021/03/23 09:00 | Matic Spec v Domagoj Biljesko | 7-5,6-2 |
| ITF M15 Szarajevó | 2021/05/30 07:30 | Michele Vianello v Lukas Palovic | 7-5,6-4 |
| ITF M15 Bucharest | 2021/05/23 10:30 | Valentin Royer v Michele Vianello | 6-2,6-1 |
| ITF M15 Cairo | 2021/05/02 09:00 | Michele Vianello v Niccolo Catini | 2-6,1-6 |
| ITF M15 Cairo | 2021/04/25 07:30 | Rimpei Kawakami v Michele Vianello | 6-2,6-4 |
| ITF M15 Sibenik | 2021/04/18 13:00 | Michele Vianello v Pietro Schiavetti | 7-5,5-7,13-15 |
| ITF M15 Antalya | 2021/01/12 07:00 | Michele Vianello v Ilya Snitari | 1-6,0-6 |
| ITF M15 Antalya | 2021/01/11 07:00 | Stefano Battaglino v Michele Vianello | 6-0,5-7,2-10 |
| ITF M15 Antalya | 2021/01/10 06:00 | Vladislav Tasenkov v Michele Vianello | 2-6,2-6 |